{"action":"closed","issue":{"url":"https://api.github.com/repos/bobc/RAMPS-FD/issues/1","repository_url":"https://api.github.com/repos/bobc/RAMPS-FD","labels_url":"https://api.github.com/repos/bobc/RAMPS-FD/issues/1/labels{/name}","comments_url":"https://api.github.com/repos/bobc/RAMPS-FD/issues/1/comments","events_url":"https://api.github.com/repos/bobc/RAMPS-FD/issues/1/events","html_url":"https://github.com/bobc/RAMPS-FD/issues/1","id":205106423,"number":1,"title":"LM7812 gets very hot","user":{"login":"fullTalgoRythm","id":7551533,"avatar_url":"https://avatars.githubusercontent.com/u/7551533?v=3","gravatar_id":"","url":"https://api.github.com/users/fullTalgoRythm","html_url":"https://github.com/fullTalgoRythm","followers_url":"https://api.github.com/users/fullTalgoRythm/followers","following_url":"https://api.github.com/users/fullTalgoRythm/following{/other_user}","gists_url":"https://api.github.com/users/fullTalgoRythm/gists{/gist_id}","starred_url":"https://api.github.com/users/fullTalgoRythm/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/fullTalgoRythm/subscriptions","organizations_url":"https://api.github.com/users/fullTalgoRythm/orgs","repos_url":"https://api.github.com/users/fullTalgoRythm/repos","events_url":"https://api.github.com/users/fullTalgoRythm/events{/privacy}","received_events_url":"https://api.github.com/users/fullTalgoRythm/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":1,"created_at":"2017-02-03T09:18:20Z","updated_at":"2017-02-03T12:31:16Z","closed_at":"2017-02-03T12:31:16Z","body":"When running @24v with JP102 -VSEL pins 1-2 selected I found that the 7812 is getting very hot. I could actually smell it even with a fan running. I believe this would be a fairly typical problem when trying to drop 12v over a linear regulator like this one. I know there are a number of workarounds and personally I replaced mine with a cheap buck converter (LM2596). I can see it is still spec'd so I thought maybe you could investigate some alternatives. Myself I wouldn't mind a separate  input for board power / hotend & fans and then just supply my own power (I did briefly feed 12v in via pin 2 of JP102 but it was a messy solution). It's probably not what most others would want but would make a nice option."}}
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